Add warp7_secure_defconfig entry to avoid the following warning:
WARNING: no maintainers for 'warp7_secure'
Signed-off-by: Fabio Estevam
WARP7 BOARD M: Fabio Estevam <fabio.estevam@nxp.com> S: Maintained F: board/warp7/ F: include/configs/warp7.h F: configs/warp7_defconfig F: configs/warp7_secure_defconfig